异种铝合金FSW叠焊接头组织性能研究

Study on Microstructure and Properties of FSW Laminated Welded Joint of Dissimilar Aluminum Alloy

模拟新能源汽车电池托盘液冷板封焊结构,对不同板厚的5083-H321及6063-T6铝合金进行异种铝合金搅拌摩擦焊叠焊工艺研究,焊后对不同板厚叠焊接头进行宏观截面、微观金相组织形貌观测及拉伸性能测试,旨在研究不同板厚搅拌摩擦叠焊接头的组织与性能。结果表明,各焊接工艺参数下的不同板厚叠焊接头内部质量完好,无隧道、孔洞等缺陷;随着距焊核中心线距离的增大,环形间距变小;当搅拌针长度选择在大于上板厚度1.5 mm时,性能最佳。

In this paper,the sealing structure of liquid-cooled plate of battery trays for new energy vehicles is simulated,and the dissimilar aluminum alloy friction stir welding process of 5083-H321 and 6063-T6 aluminum alloys with different plate thicknesses is studied.After welding,the macro section,microstructure morphology and tensile properties of the welded joints with different plate thicknesses are observed,in order to study the microstructure and properties of the welded joints with different plate thicknesses.The results show that the internal quality of the welded joints with different plate thickness under different welding parameters is intact,and there are no defects such as tunnels and holes,and the unique onion ring morphology of friction stir welding with laminar spacing is obvious in the welding core area.When the length of the stirring needle is greater than the thickness of the upper plate 1~1.5mm,the performance is the best.